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Etymology tree Proto-Indo-European *kob-der. Proto-Germanic *hampą Proto-Indo-European *-yéti Proto-Germanic *-janą Proto-Germanic *hampijanąder. Old Norse *happader.? ▲ Proto-Germanic *hampijanąder. Old Norse *heppader.? Old English hæppander.? Middle English happen Proto-Indo-European *-o- Proto-Indo-European *-nom Proto-Indo-European *-onom Proto-Germanic *-aną Proto-Indo-European *-yeti Proto-Indo-European *-éyeti Proto-Germanic *-janą Old English -an Middle English -en Middle English happenen English happen From Middle English happenen, hapnen, augmented from Middle English happen (“to come to pass, happen”), perhaps from Old English hæppan (“to move accidentally, slip”) and/or from Old Norse *happa, *heppa, from Proto-Germanic *hampijaną (“to fit in, be fitting”). Equivalent to hap (“a chance, occurrence, byfall”) + -en (verbal suffix).